Constructed in 1906, the house is an example of an ornamental concrete block residence.  Its Queen Anne detailing is an unusual expression for concrete block construction and for Costilla County.

Consisting of two 18-foot spans, the steel multiplate arch culvert is faced with local volcanic fieldstone. 

Established in 1851, San Luis is the oldest continuously inhabited town in Colorado.

The 1911 power plant is located along the St. Vrain River just northeast of the town of Lyons.  

Built in 1894, the church is one of the oldest unaltered buildings in Lyons. 

The house is a well preserved example of wood frame miner housing.  

With its pressed tin siding, cornice treatment and window trim intact, the building is an excellent surviving example of the late 19th century vernacular commercial design once commonly found in small towns.  

The house is one of the best preserved examples of a wood frame vernacular cottage in Louisville.  

In a community consisting primarily of modest frame houses, the Robinson House remains as one of Louisville’s largest and most elaborate historic residences. 

Iglesia de San Francisco de Assisi is significant for Hispanic Heritage as the central gathering place for the community of San Francisco (La Valley).